Enantioselective Formal Hydration of α,β-Unsaturated Imides by Al-Catalyzed Conjugate Addition of Oxime Nucleophiles
作者:Christopher D. Vanderwal、Eric N. Jacobsen
DOI:10.1021/ja045563f
日期:2004.11.1
(salen)Al-catalyzed asymmetric conjugate addition of salicylaldoxime to α,β-unsaturated imides is the key step in an efficient and highly enantioselective two-step formal hydration of these electron-deficient olefins. This reaction constitutes the first example of an enantioselective conjugate addition of an oxygen-centered nucleophile to α,β-unsaturated carboxylic acid derivatives. Application of this method
(salen)Al 催化的水杨醛肟与 α,β-不饱和酰亚胺的不对称共轭加成是这些缺电子烯烃高效且高度对映选择性的两步形式水合的关键步骤。该反应构成了以氧为中心的亲核试剂与 α,β-不饱和羧酸衍生物的对映选择性共轭加成的第一个例子。将该方法应用于手性非外消旋底物显示出高水平的催化剂诱导的非对映选择性,强调了其在聚酮化合物天然产物合成中的潜在用途。